/*************************************************************************
	> File Name: B2029.cpp
	> Author: yufangze
	> Mail: 2224590123@qq.com
	> Created Time: 2024-12-23 18:26:49
 ************************************************************************/

#include <iostream>
#include <cmath>
using namespace std;

int main() {
    double h, r, pi = 3.14;
    cin >> h >> r;
    double S = pi * r * r * h / 1000;
    cout << ceil(20 / S) << endl;
    return 0;
}
